ISPPAC10-01SI LATTICE [Lattice Semiconductor], ISPPAC10-01SI Datasheet - Page 16

• Manufacturer Part Number: ISPPAC10-01SI
• Description: In-System Programmable Analog Circuit
• Manufacturer: LATTICE [Lattice Semiconductor]

Design Entry Software
Designers configure the ispPAC10 and verify its perfor-
mance using PAC-Designer, an easy to use, Microsoft
Windows compatible program. Circuit designs are en-
tered graphically and then verified, all within the
PAC-Designer environment. Full device programming is
supported using PC parallel port I/O operations and a
download cable connected to the serial programming
interface of the ispPAC10. A library of configurations is
included with basic solutions and examples of advanced
circuit techniques. In addition, comprehensive on-line
and printed documentation is provided that covers all
aspects of PAC-Designer operation.
The PAC-Designer schematic window, shown in Figure
12, provides access to all configurable ispPAC10 ele-
ments via its graphical user interface. All analog input
and output pins are represented. Static or non-config-
urable pins such as power, ground, VREF
serial digital interface are omitted for clarity. Any element
Figure 12. Initial PAC-Designer Schematic Design Entry Screen
Software-Based Design Environment
Ready
OUT1
OUT2
PAC Designer - [Design1]
IN1
IN2
File
Edit
View
IA1
IA2
IA3
IA4
1
1
1
1
Tools
PAC Block 1
PAC Block 2
Options
OUT
Window
, and the
OA1
OA2
2.5V
2.5V
1.07 pF
1.07 pF
UES = 00000000
Help
16
in the schematic window can be accessed via mouse
operations as well as menu commands. When com-
pleted, configurations can be saved, simulated, and
downloaded to devices.
PAC-Designer operation can be automated and ex-
tended by using custom-designed Visual Basic
that set the interconnections and the parameters of
ispPAC products. These stand-alone programs are called
circuit generator macros. An example of such a macro is
the biquad filter generator supplied with PAC-Designer.
With this macro, filter parameters such as gain, Q and
corner frequency are input directly and then automati-
cally converted to a schematic configuration. The
application example shown in Figure 7b was generated
using the biquad filter generator macro. More information
on this and other topics is included in the on-line docu-
mentation as well as ispPAC application notes.
1.07 pF
1.07 pF
2.5V
2.5V
OA3
OA4
Specifications ispPAC10
PAC Block 3
PAC Block 4
1
IA5
IA6
IA7
IA8
1
1
1
OUT3
OUT4
IN3
IN4
®
programs